T104测试线。用于双向传输损耗测量，由远至近噪声测量以及通常用于测试长途中继线的由远至近的噪声。
The T104 test, used for two-way transmission loss measurements, far-to-near noise measurements and near-to-far noise checks is normally used in testing toll trunks.
T104测试线。用于双向传输损耗测量，由远至近噪声测量以及通常用于测试长途中继线的由远至近的噪声。
The T104 test, used for two-way transmission loss measurements, far-to-near noise measurements and near-to-far noise checks is normally used in testing toll trunks.
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